摘要
模型参数的选择影响着城市雨洪模拟计算的精度,基于正交试验法与水力学地表产汇流原理,建立城市雨洪计算模型,选取7个典型特征参数,制定了L_(18)(3^(7))正交表,借助正交试验方案来模拟所选参数在不同因素水平下对模拟计算的影响作用,并进行参数灵敏度分析。结果表明:汇水区面积划分疏密程度、地表不透水粗糙系数、管径对地表节点总洪流量和节点超载时长的影响较为灵敏;沿地表汇流路径,参数的灵敏度变化与所处位置相关;其中,管道坡度在0.15%~0.4%范围内影响最不明显。根据参数灵敏度分析结果来确定参数,可以提高建模效率,提高城市雨洪计算模型的准确性与适用性。该研究结果可为城市雨洪模型建模过程中不同参数值的确定与灵敏度分析提供支持。
The choose of parameters affect the accuracy of urban flood simulation. Based on the orthogonal test method and the principle of hydraulic surface runoff and confluence, the urban flood calculation model is established. Seven typical characteristic parameters are selected to make the orthogonal table L_(18)(3^(7)). By the orthogonal test schemes,the influence of the selected parameters on the simulation calculation under different factor levels are simulated,and the parameter sensitivity are analyzed. The results show that the density of catchment area, the impervious roughness coefficient of surface and the diameter of underground pipe network have sensitive effect on the flood discharge of surface nodes and overload time;Along the confluence path, the change of parameter sensitivity is related to the location and the pipeline slope in the range of 0.15%-0.4% has the least effect among them. Determining the parameters according to the results of parameter sensitivity analysis can improve the modeling efficiency, the accuracy and applicability of urban flood model. This result can provide theoretical support for the determination of different parameters and sensitivity analysis of urban flood model.
作者
马耀鲁
王近
潘国瑞
廖源铭
Ma Yaolu;Wang Jin;Pan Guorui;Liao Yuanming(Power China Kunming Engineering Corporation Limited,Kunming 650051,China)
出处
《市政技术》
2022年第2期130-133,共4页
Journal of Municipal Technology
关键词
城市雨洪
参数灵敏度
正交试验
数值模型
urban flood
parameter sensitivity
orthogonal method
numerical model
